Good-adhesiveness and difficult-falloff thermal barrier coating layer and preparation method thereof

Abstract

The invention discloses a good-adhesiveness and difficult-falloff thermal barrier coating layer. Aluminum powder is added for high-temperature calcining modification to improve the oxidation resistance of a ceramic phase and the permeability with base metal; and in the spraying process, part particles are insufficiently fused in plasma jet flows, and are weakened in deformation degree in collision with a basal body to easily form a joined porous structure, so that the heat insulation property of the coating layer is improved; through the modification method, Y3+ and Ce4+ in zirconium dioxide lattices replace Zr4+ to generate oxygen vacancies and local stress fields, so that the phonon scattering in the lattices is enhanced, and the heat conductivity is obviously reduced; and the atomic weight of solid solution atoms Ce is far more than the atomic weight of Y, so that the phonon scattering strength in the product can be prominently improved, and the heat conductivity is reduced. The prepared coating layer is high in surface hardness, and has good adhesiveness, difficult falloff, molten salt corrosion resistance and excellent thermal shocking resistance.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a thermal barrier coating with good adhesion and not easy to fall off and a manufacturing method thereof. Background technique [0002] With the development of aviation gas turbines in the direction of high flow ratio, high thrust-to-weight ratio, and high inlet temperature, the working temperature in the combustion chamber has far exceeded the service temperature limit of Ni-based superalloys. The preparation of thermal barrier coatings on the surface of superalloy substrates has a very direct effect on improving the temperature bearing capacity of the substrates, thereby effectively increasing the working temperature of parts and prolonging their service life. [0003] Thermal barrier coating is generally a functional coating that utilizes materials with relatively low thermal conductivity and is coated on the surface of superalloy substrates with appropriat...

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Problems solved by technology

However, when thermal barrier coatings are applied to increasingly high working temperatures, they will face more harsh working environments. The thermal barrier coatings prepared by the prior art are prone to phase change, low in oxidation resistance, low in strength, and poor in high temperature stability. , easy to produce defects such as high temperature corrosion, it is difficult to meet the needs of further increase in turbine inlet temperature